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Capacity and Throughput Optimization in Multi-Cell 3G WCDMA Networks

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Capacity and Throughput Optimization in Multi-Cell 3G WCDMA Networks Nguyen, Son, Capacity and Throughput Optimization in Multi-cell 3G WCDMA Networks Master of Science (Computer Science and Engineering), August 2005, 82 pp., 16 tables, 25 figures, 50 titles. User modeling aids in the computation of the traffic density in a cellular network, which can be used to optimize the placement of base stations and radio network controllers as well as to analyze the performance of resource management algorithms towards meeting the final goal: the calculation and maximization of network capacity and throughput for different data rate services. An analytical model is presented for approximating the user distributions in multi-cell third generation Wideband Code Division Multiple Access (WCDMA) networks using 2-dimensional Gaussian distributions by determining the means and the standard de- viations of the distributions for every cell. This allows for the calculation of the inter-cell interference and the reverse-link capacity of the network. An analytical model for optimizing capacity in multi-cell WCDMA networks is presented. Capacity is optimized for different spreading factors and for perfect and imperfect power control. Numerical results show that the SIR threshold for the received signals is decreased by 0.5 to 1.5 dB due to the imperfect power control. The results also show that the determined parameters of the 2-dimensional Gaussian model matches well with traditional methods for modeling user distribution. A Call Admission Control algorithm is designed that maximizes the throughput in multi- cell WCDMA networks. Numerical results are presented for different spreading factors and for several mobility scenarios. Our methods of optimizing capacity and throughput are computational efficient, accurate, and can be implemented in large WCDMA networks. CAPACITY AND THROUGHPUT OPTIMIZATION IN MULTI-CELL 3G WCDMA NETWORKS Son Nguyen, B.S. Thesis Prepared for the Degree of MASTER OF SCIENCE UNIVERSITY OF NORTH TEXAS August 2005 APPROVED: Robert Akl, Major Professor Robert Brazile, Committee Member and Graduate Coordinator Steve Tate, Committee Member Krishna Kavi, Chair of the Department of Computer Sciences Oscar N. Garcia, Dean of the College of Engineering Sandra L. Terrell, Dean of the Robert B. Toulouse School of Graduate Studies ACKNOWLEDGMENTS First and foremost, I would like to give my heartfelt thanks to my advisor Dr. Robert Akl for taking on multitude of roles that provided guidance and direction. During this journey, I had sometimes felt I could not progress any further, but his whole-hearted devotion and enthusiasm not only kept me on track but also lightened up the way to the completion of this work. Furthermore, I am highly indebted to the members of my committee Dr. Robert Brazile and Dr. Steve Tate for their careful reading and suggestions. I am also very grateful to my parents for their unconditional love and many years of support. Above all, I would like to thank Khanh Ha Nguyen who has been an inspiration and a partner from the very beginning. ii CONTENTS ACKNOWLEDGEMENTS iii LIST OF TABLES vii LIST OF FIGURES ix 1 INTRODUCTION 1 1.1CDMAHistory.................................. 1 1.2Objectives..................................... 2 1.3Organization................................... 2 2 CDMA AND WCDMA OVERVIEW 4 2.1 Introduction to CDMA . 4 2.1.1 PowerControl............................... 7 2.1.2 Frequency Reuse . 8 2.1.3 Voice Activity Detection . 8 2.1.4 Cell Sectoring . 9 2.1.5 SoftHandoff................................ 9 2.2WCDMAOverview................................ 10 3 USER AND INTERFERENCE MODELING USING 2-D GAUSSIAN FUNCTION 17 3.1Introduction ................................... 17 3.2RelatedWork................................... 17 3.3 User and Interference Model . 18 3.4 Numerical Results . 20 3.4.1 Uniform Distribution of Users . 21 iii 3.4.2 Users Densely Clustered at the Center of the Cells . 21 3.4.3 Users Distributed at Cells’ Boundaries . 26 3.5Conclusions.................................... 28 4 WCDMA CAPACITY 29 4.1Introduction.................................... 29 4.2RelatedWork................................... 29 4.3 WCDMA Capacity with Perfect Power Control . 31 4.4 WCDMA Capacity with Imperfect Power Control . 32 4.5 Spreading and Scrambling . 33 4.6 Numerical Results . 35 4.6.1 WCDMA Capacity Optimization with SF of 256 . 37 4.6.2 WCDMA Capacity Optimization with SF of 64 . 37 4.6.3 WCDMA Capacity Optimization with SF of 16 . 39 4.6.4 WCDMA Capacity Optimization with SF of 4 . 41 4.7Conclusions.................................... 43 5 WCDMA CALL ADMISSION CONTROL AND THROUGHPUT 46 5.1Introduction.................................... 46 5.2FeasibleStates.................................. 46 5.3MobilityModel.................................. 47 5.4 WCDMA Call Admission Control . 49 5.5 Network Throughput . 50 5.6 Calculation of N ................................. 51 5.7 Maximization of Throughput . 52 5.8 Numerical Results . 52 5.8.1 WCDMA Throughput Optimization with SF of 256 . 54 iv 5.8.2 WCDMA Throughput Optimization with SF of 64 . 54 5.8.3 WCDMA Throughput Optimization with SF of 16 . 56 5.8.4 WCDMA Throughput Optimization with SF of 4 . 56 5.9Conclusions.................................... 60 6 CONCLUSIONS 62 6.1Summary..................................... 62 6.2FutureResearch.................................. 63 v LIST OF TABLES 2.1 Main differences between WCDMA and IS-95 air interfaces . 13 3.1 The maximum number of users in every cell for the 27 cell WCDMA network (with σ1 and σ2 are increased from 5000 to 15000 while µ1 = 0 and µ2 = 0). This results in users distributed uniformly in all BSs. 22 3.2 The maximum number of users in 27 cells of WCDMA network as the values of σ1 and σ2 are increased from 100 to 400 while µ1 = 0 and µ2 = 0. This results in users densely clustered around the BSs. 24 3.3 The values of σ1, σ2, µ1, and µ2 for the 2-D Gaussian approximation of users clustered at the boundaries of the cells as shown in Fig. 3.6. The maximum numberofusersis133............................... 27 4.1 Functionality of the channelization and scrambling codes. 34 4.2 Uplink DPDCH data rates. 36 4.3 Capacity calculation for uniform user distribution with SF = 256 and Eb = Io 7.5dB........................................ 38 4.4 Capacity calculation for uniform user distribution with SF = 64 and Eb = 7.5 Io dB.......................................... 40 4.5 Capacity calculation for uniform user distribution with SF = 16 and Eb = 7.5 Io dB.......................................... 42 4.6 Capacity calculation for uniform user distribution with SF = 4 and Eb = 7.5 Io dB.......................................... 44 5.1 The low mobility characteristics and parameters. 53 5.2 The high mobility characteristics and parameters. 54 vi 5.3 Calculation of N for uniform user distribution with SF = 256 and blocking probability=0.02................................. 55 5.4 Calculation of N for uniform user distribution with SF = 64 and blocking probability=0.02................................. 58 5.5 Calculation of N for uniform user distribution with SF = 16 and blocking probability=0.02................................. 59 5.6 Calculation of N for uniform user distribution with SF = 4 and blocking probability=0.02................................. 61 vii LIST OF FIGURES 2.1 Comparison between FDMA, TDMA, and CDMA. 4 2.2 Frequency Hopping Spreading Spectrum. 6 2.3 Time Hopping Spreading Spectrum. 6 2.4 2 GHz band spectrum allocation in Europe, Japan, Korea, and US (MSS = Mobile Satellite Spectrum). 12 2.5 Development to all-IP for 3G services. 15 3.1 Inter-cell interference on cell i from users in cell j . 19 3.2 2-D Gaussian approximation of users uniformly distributed in the cells. σ1 = σ2 = 12000, µ1 = µ2 = 0. The maximum number of users is 548. 23 3.3 Simulated network capacity where users are uniformly distributed in the cells. The maximum number of users is 554. 23 3.4 2-D Gaussian approximation of users densely clustered around the BSs. σ1 = σ2 = 100, µ1 = µ2 = 0. The maximum number of users is 1026. 25 3.5 Simulated network capacity where users are densely clustered around the BSs causing the least amount of inter-cell interference. The maximum number of users is 1026 in the network. 25 3.6 2-D Gaussian approximation of users clustered at the boundaries of the cells. The values of σ1, σ2, µ1, and µ2 may be different in the different cells and are given in Table 3.3. The maximum number of users is 133. 26 3.7 Simulated network capacity where users are clustered at the boundaries of the cells causing the most amount of inter-cell interference. The maximum number of users is only 108 in the network. 28 4.1 Generation of OVSF codes for different Spreading Factors. 33 4.2 Relationship between spreading and scrambling. 34 viii 4.3 12.2 Kbps Uplink Reference channel. 35 4.4 64 Kbps Uplink Reference channel. 36 4.5 Average number of slot per sector for perfect and imperfect power control analysis with a Spreading Factor of 256. 39 4.6 Average number of slot per sector for perfect and imperfect power control analysis with a Spreading Factor of 64. 41 4.7 Average number of slot per sector for perfect and imperfect power control analysis with a Spreading Factor of 16. 43 4.8 Average number of slot per sector for perfect and imperfect power control analysis with a Spreading Factor of 4. 45 5.1 Average throughput in each cell for SF = 256. 56 5.2 Average throughput in each cell for SF = 64. 57 5.3 Average throughput in each cell for SF = 16. 57 5.4 Average throughput in each cell for SF = 4. 60 ix CHAPTER 1 INTRODUCTION 1.1 CDMA History The global mobile communications market has expanded very rapidly [13]. From analog phone systems in the 70’s and 80’s, cellular phone systems have progressed to digital cellu- lar systems in their second generation (2G) with Time Division Multiple Access (TDMA), Frequency Division Multiple Access (FDMA), and Code Division Multiple Access (CDMA) technologies in the 90’s.
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